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Author Message   Chenard Tinkerer Username: Chenard Post Number: 19 Registered: 11-2006 Rating: N/A Votes: 0 Posted on Tuesday, September 25, 2007 - 02:36 pm:    This is interesting. I noticed a very similar effect with my Agfa Isolettes, which are scale focused cameras. I discovered it while attempting to set infinity and close focus using a ground glass . You can read about it in this thread: https://kyp.hauslendale.com/classics/forum/messages/2/9283.html?1177951146 So...if there is focus shift due to spherical aberrations wide open, what is the correct aperture to use while setting the focus on a scale focused camera? Where in the image should the sharpness be judged while setting the focus--middle, corner, halfway? Paul